THE INFLORESCENCE. 93 



A COMPOUND CORYMB is a corymb with the flowers 

 growing upon branches of the pedicels. Fig. 170. 



FIG. 171. 



Compound Umbel. 



A COMPOUND UMBEL has a second umbel, or um- 

 bellet, upon each pedicel. 



NOTE. Most of the clusters pictured in this exercise are 

 represented as without bracts, that differences in their modes 

 of branching may be more easily compared. The pictures 

 represent certain styles of flowering, and each of these styles 

 varies very much in nature. You will find umbels very unlike 

 each other, and very unlike Fig. 170, but still more nearly like 

 that figure than any of the others. And so of panicles, co- 

 rymbs, &c. Great differences among the clusters of one variety 

 may be occasioned by the presence or absence of bracts, by 

 their groupings, forms, and colors, by the length, stiffness, and 

 ever varying positions of peduncles and pedicels, as well as by 

 differences in the form of receptacles. And besides, the vari- 

 ous sorts run together in many different ways. You will 

 sometimes find a flower-cluster resembling two different varie- 

 ties so much that you will have to combine the names of the 

 two in order to characterize it properly ; as, for instance, a 

 corymbose panicle, a panicle of heads, or a spicose umbel. 

 When you cannot name the variety, say so, and keep the in- 

 stance in mind until it becomes clear to you. 



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